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Old 07-12-2022, 08:51 AM   #1
std1940
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Default 1940 gear oils

I am planning on changing my transmision and rear end fluids in my stock 1940 Ford Standard Coupe.
What is everybody using to make the 82 year old components happy?
Brands and weights?
Thanks Tom.
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Old 07-12-2022, 09:20 AM   #2
Ken/Alabama
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Default Re: 1940 gear oils

I use 85-90 wt and you really need GL4 if you can find it. It’s not hard on the brass parts in the transmission.
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Old 07-12-2022, 09:33 AM   #3
Bill OH
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Default Re: 1940 gear oils

I use 90w and a max of GL4 - stay away from GL5 in the transmission, ruins brass synchros.
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Old 07-12-2022, 11:55 AM   #4
19Fordy
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Default Re: 1940 gear oils

I use this in my 1940 Ford transmission and rear end.
https://www.oreillyauto.com/detail/c...ar+lube&pos=11

For winter driving you may want to use a lighter weight GL4.

https://www.oreillyauto.com/detail/c...ar+lube&pos=13

I have found Oreilly sells this product at the lowest price.
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Old 07-12-2022, 02:56 PM   #5
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Default Re: 1940 gear oils

For years now I have used Sta-Lube GL4 / 140wt. in trans & rearend. I get it@ NAPA.- F F
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Old 07-12-2022, 07:36 PM   #6
Tim Ayers
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Default Re: 1940 gear oils

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85W-90 Sta-Lube GL-4 can be ordered in from any Napa dealer.
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Old 07-12-2022, 09:00 PM   #7
FL&WVMIKE
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Default Re: 1940 gear oils

Gear oils labeled both GL4/GL5 should also be safe.
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Old 07-13-2022, 10:04 AM   #8
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Default Re: 1940 gear oils

Thank You everyone for your wealth of advice!
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Old 07-13-2022, 10:32 AM   #9
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Default Re: 1940 gear oils

GL-5 is high EP and the extra pressure additive can be harmful to the soft metal bushings and thrust washers in a transmission. It works fine in the rear axle though unless you have a model T.
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Old 07-13-2022, 12:56 PM   #10
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Default Re: 1940 gear oils

One more thing to add... For those wanting a high performance GL4 oil, Brad Penn/Penngrade sells a nice formulation... for a reasonable price. Below are links to places that it.
One specializes in Ford Toploader transmissions, but it can be purchased at other places as well. Summit is the cheapest at $8/qt. Can read reviews at Summit.

http://4speedtoploaders.com/store/gearoil.html

https://www.summitracing.com/search/...n%20gear%20oil
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Old 07-13-2022, 08:00 PM   #11
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Default Re: 1940 gear oils

Quote:
Originally Posted by rotorwrench View Post
GL-5 is high EP and the extra pressure additive can be harmful to the soft metal bushings and thrust washers in a transmission. It works fine in the rear axle though unless you have a model T.
Or a Columbia.
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Old 07-14-2022, 07:14 AM   #12
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Default Re: 1940 gear oils

Columbia has brass washers at the spider gears and both thrust faces of the axles. IMO stay away from the GL-5 in the Columbia.
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